If you’re wondering why BMW has bucked tradition and introduced the production version of the new 650i convertible before even showing the coupe, it’s a classic case of launching a convertible in the springtime. According to a BMW spokesman we spoke to at the Detroit auto show, the reverse staggered launch was chosen in order to have droptops in dealerships by summertime. After all, it’s much easier to sell muscle-bound, rear-drive ragtops when the sun is out and breezes are warm than during the dark, dreary dog days of winter. The 6-series coupe, previewed in concept form at the Paris auto show, will have its coming-out party sometime this summer, we’re told. Look for it on sale later this fall, presumably at a price lower than the $91,375 commanded by the droptop—likely around $85K.